Transform: use the scenes transform orientation

- Use the user orientation when pressing XYZ keys,
  second press switches to global.
- Pressing again switches to global, or local
  if you're have global orientation set.

The option for gizmos to have their own orientations will be added,
see: D4075

source/blender/editors/transform/transform.c

@@ -1381,15 +1381,15 @@ int transformEvent(TransInfo *t, const wmEvent *event)
 						}
 						else {
 							if (event->shift) {
-								initSelectConstraint(t, t->spacemtx);
-							}
-							else {
 								/* bit hackish... but it prevents mmb select to print the orientation from menu */
 								float mati[3][3];
 								strcpy(t->spacename, "global");
 								unit_m3(mati);
 								initSelectConstraint(t, mati);
 							}
+							else {
+								initSelectConstraint(t, t->spacemtx);
+							}
 							postSelectConstraint(t);
 						}
 					}

source/blender/editors/transform/transform_generics.c

@@ -1408,13 +1408,14 @@ void initTransInfo(bContext *C, TransInfo *t, wmOperator *op, const wmEvent *eve
 		t->orientation.index = 0;
 		ARRAY_SET_ITEMS(
 		        t->orientation.types,
-		        NULL,
-		        &t->orientation.user);
+		        &t->orientation.user,
+		        NULL);
 
 		/* Make second orientation local if both are global. */
 		if (t->orientation.user == V3D_MANIP_GLOBAL) {
 			t->orientation.user_alt = V3D_MANIP_LOCAL;
-			t->orientation.types[1] = &t->orientation.user_alt;
+			t->orientation.types[0] = &t->orientation.user_alt;
+			SWAP(short *, t->orientation.types[0], t->orientation.types[1]);
 		}
 
 		/* exceptional case */